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  • Master Lock 379ATPY Universal Trailer Coupler Lock
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Master Lock 379ATPY Universal Trailer Coupler Lock

4.6 out of 5 stars 5,476 ratings
To see product details, add this item to your cart. You can always remove it later.

Purchase options and add-ons

Brand Master Lock
Special feature Key Lock
Lock type Key Lock
Item dimensions L x W x H 13 x 8.9 x 11.7 Centimetres
Material Zinc
Style Trailer Hitch Lock
Colour Black
Number of pieces 1
Finish type Polished
Included components Unit^Instruction Guide

About this item

  • Designed to provide safety and prevents picking and prying for the coupler
  • Universal trailer coupler lock fits 1-7/8in (48mm), 2in (51mm) and most 2-5/16in (59mm) couplers
  • Chrome plated and Corrosion resistant
  • Easy to install
  • Re-keyable cylinder for keyed alike convenience

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Videos for similar products

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Top Brand: Master Lock

Highly Rated
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From the manufacturer

Product description

Master Lock Universal Trailer Coupler Lock is designed to provide safety as well as to prevent picking and prying for the coupler. This lock fits 1 to 0.88 inch and 2 inch coupler and is chrome plated. It is easy to install and is corrosion resistance.

Product information

Technical Details

Manufacturer ‎Master Lock
Place of Business ‎Nanaimo, BC V9T 2L8, CA
Brand ‎Master Lock
Model ‎Universal Towing Coupler Lock, Steel
Product Dimensions ‎12.95 x 8.89 x 11.68 cm; 453.59 g
Item model number ‎379ATPY
Is discontinued by manufacturer ‎No
Exterior ‎Smooth
Manufacturer part number ‎379ATPY
Special features ‎Key Lock
Item Weight ‎454 g
Country of origin ‎China

Additional Information

ASIN B000L9QRE8
Customer Reviews
4.6 out of 5 stars 5,476 ratings

4.6 out of 5 stars
鶹 Rank
Date First Available Aug. 6 2012

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Master Lock 379ATPY Universal Trailer Coupler Lock
Master Lock379ATPY Universal Trailer Coupler Lock
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Price$73.05$69.99-6%$49.72
Was: $53.02		-24%$30.59
List: $39.99		$15.99$29.99
Delivery
Get it by Saturday, Aug 16
Get it by Sunday, Aug 17
Get it by Saturday, Aug 16
Get it by Saturday, Aug 16
Get it by Saturday, Aug 16
Get it by Saturday, Aug 16
Customer ratings
4.64.6 out of 5 stars5,476
4.74.7 out of 5 stars4
4.24.2 out of 5 stars419
4.44.4 out of 5 stars932
4.44.4 out of 5 stars1,678
4.04.0 out of 5 stars69
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Customer reviews

4.6 out of 5 stars
5,476 global ratings

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Customers say

Customers like the ease of use, durability, and security of the product. They mention it works really well, is sturdy, and offers good protection. Customers also say it's a great product and appreciate its functionality. However, some customers disagree on the fit.

Select to learn more

Ease of useDurabilitySecurityFunctionalityFit
64 customers mention "Ease of use"64 positive0 negative

Customers like the ease of use of the product. They mention it works well, is easy to install, and slips onto the hitch without problem. Some also say it's nice working on different trailers.

"Seems well put together easy to use and not bulky." Read more

"Works well. Should prevent theft of trailer" Read more

"works great - just be sure to keep a copy of the key number in case you lose the keys and do what I did and buy a key box and tags" Read more

"Easy to use sturdy and durable. Glad I bought it." Read more

37 customers mention "Durability"33 positive4 negative

Customers like the durability of the lock. They mention it appears well-built, is secure, and provides good protection.

"Seems to be sturdy got it when promised , so far we are happy with our purchase" Read more

"clean, simple, durable and I haven’t heard much on breaking in/open issues." Read more

"...Would have liked it to fit snug for more confidence. Solid construction." Read more

"Solid, works well, not sure how it will weather....time will tell." Read more

36 customers mention "Security"34 positive2 negative

Customers are satisfied with the security of the product. They mention it's a good lock, much more secure than the "U"-shaped locks for hitches, and protects against theft. Customers also say it's an effective and dissuasive defense.

"Great Lock / quick delivery / easy installation" Read more

"Great lock. Worked better than expected." Read more

"much more secure that the "U" shaped locks for hitches." Read more

"...In the description of lock it said Designed to provide safety and prevents picking and prying for the coupler..." Read more

30 customers mention "Functionality"30 positive0 negative

Customers like the functionality of the lock. They mention it works well, appears sturdy, and serves its purpose. Some say it's easy to install. However, some customers have mixed opinions on the value for money.

"Great product. Super easy to use. My boat and trailer will be wintering outside. It's good to know that my investment is secure." Read more

"great and easy to use, good for the honest thieves but can be easily broken but all we need for our area" Read more

"Does the job especially if you don’t want to spend 250$ for the higher end ones. I’ve had this for a while now and my trailer is still here...." Read more

"good product. good service" Read more

24 customers mention "Fit"14 positive10 negative

Customers have mixed opinions about the fit of the lock. Some mention it fits the hitch and works with their existing tongue locks to provide double. However, others say it doesn't fit all trailer tongues and is loose on a 2" coupler trailer hitch.

"Fits fine! Perfect!" Read more

"...Very small and loose in the ball/hitch." Read more

"Fit and works for my class III hitch." Read more

"...Seems to be made a little later than I expected. Does not seem to tighten right up. You can move it around for a bit once it is installed...." Read more

Very Good Quality !
5 out of 5 stars
Very Good Quality !
Weight is a bit lighter than expected for this lock size. Very simple to use and cheaper than Trimax more expensive products. Fits perfectly on my REMEQ "UG-64120" utility trailer.
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Top reviews from Canada

  • Marc Filiatrault
    5.0 out of 5 stars Produit de qualité!
    Reviewed in Canada on April 28, 2025
    Verified Purchase
    Cadenas bien fait. Facile à installer.
    One person found this helpful
    Helpful
     Report
  • Glenn R.
    5.0 out of 5 stars Hitch Lock
    Reviewed in Canada on June 17, 2024
    Verified Purchase
    Great Lock / quick delivery / easy installation
    Helpful
     Report
  • Williamcarruthers
    4.0 out of 5 stars Trailer lock
    Reviewed in Canada on February 11, 2024
    Verified Purchase
    Good works ok
    Helpful
     Report
  • Shane Simpson
    5.0 out of 5 stars Great product - easy to take on/off
    Reviewed in Canada on June 2, 2024
    Verified Purchase
    At first I thought it didn’t fit my hitch - to telly my fault. There are no instructions with it - just the picture on the outside of the box. I didn’t think to list the lever on the hitch so the lock would rest inside and then once I closed the lever I understood how it was supposed to work. Then turn the key and go. 👍.
    2 people found this helpful
    Helpful
     Report
  • Excellent! Perfect fit!
    5.0 out of 5 stars Hitch Lock!
    Reviewed in Canada on September 9, 2024
    Verified Purchase
    Fits fine!
    Perfect!
    Helpful
     Report
  • Michel Lalancette
    5.0 out of 5 stars excellent produit
    Reviewed in Canada on October 15, 2024
    Verified Purchase
    de qualité et fait bien le travail
    One person found this helpful
    Helpful
     Report
  • 鶹 Customer
    5.0 out of 5 stars Did the job as stated
    Reviewed in Canada on January 3, 2025
    Verified Purchase
    Worked as stated and just the appearance is a good deterrent to theives.
    One person found this helpful
    Helpful
     Report
  • JM
    3.0 out of 5 stars Ok but not trusted
    Reviewed in Canada on September 12, 2024
    Verified Purchase
    I feel like it would be easy to smash this off or twist it enough to make it come loose/off. Very small and loose in the ball/hitch.
    Helpful
     Report

Top reviews from other countries

Translate all reviews to English
  • mahesh kumar
    5.0 out of 5 stars Strong and Secure Lock
    Reviewed in the United States on March 27, 2025
    Verified Purchase
    This hitch lock is solid and well-built! It fits perfectly on my trailer and gives me peace of mind knowing my trailer is secure. The key mechanism works smoothly, and installation was quick and easy. Great protection against theft—highly recommend!
    Report
  • DBB
    5.0 out of 5 stars Great, solid and secure
    Reviewed in Australia on April 19, 2024
    Verified Purchase
    Great product
    Report
  • ANTONIO ASUNSOLO
    5.0 out of 5 stars Buen candado
    Reviewed in Mexico on August 10, 2024
    Verified Purchase
    Muy buen artículo. Se ajusta bien sin importar el tamaño y grosor de la almendra de recepción.
    Report
  • Dan
    4.0 out of 5 stars Doesn’t work with anti-rattle bolt
    Reviewed in Australia on March 30, 2024
    Verified Purchase
    Feels good and strong, but doesn’t fit on couplings with an anti rattle bolt.
    Report
  • Rob
    5.0 out of 5 stars Excelente Candado para remolque
    Reviewed in Mexico on December 29, 2023
    Verified Purchase
    Embona muy bien y el sistema de fijación y seguridad funcionan como se espera.
    El material se siente resistente y con la dureza esperada para un candado de este tipo.
    En cuanto al acabado habrá que ver la duración de la pintura a largo plazo. Por el momento ya pasó un mes y no hay grietas, desportillados u oxidación, sigue con buena apariencia.
    Report